How to parse a string and create several columns from it?

Question

I have a varchar(max) field containing Name Value pairs, in every line I have Name UnderScore Value.

I need to do a query against it so that it returns

Answer 1

 DECLARE @TExt NVARCHAR(MAX)= '***[ffffd]***
    dfdf
    fdfdfdfdfdf
    ***[fff]***
    4545445
    45454
    ***[ahaASSDAD]***

    DFDFDF
    ***[SOME   TEXT]***
    '

    DECLARE @Delimiter VARCHAR(1000)= CHAR(13) + CHAR(10) ;
    WITH    numbers
              AS ( SELECT   ROW_NUMBER() OVER ( ORDER BY o.object_id, o2.object_id ) Number
                   FROM     sys.objects o
                            CROSS JOIN sys.objects o2
                 ),
            c AS ( SELECT   Number CHARBegin ,
                            ROW_NUMBER() OVER ( ORDER BY number ) RN
                   FROM     numbers
                   WHERE    SUBSTRING(@text, Number, LEN(@Delimiter)) = @Delimiter
                 ),
            res
              AS ( SELECT   CHARBegin ,
                            CAST(LEFT(@text, charbegin) AS NVARCHAR(MAX)) Res ,
                            RN
                   FROM     c
                   WHERE    rn = 1
                   UNION ALL
                   SELECT   c.CHARBegin ,
                            CAST(SUBSTRING(@text, res.CHARBegin,
                                           c.CHARBegin - res.CHARBegin) AS NVARCHAR(MAX)) ,
                            c.RN
                   FROM     c
                            JOIN res ON c.RN = res.RN + 1
                 )
        SELECT  *
        FROM    res

Answer 2

With a CTE you will have a problem with Recursion if more that 100 items

Msg 530, Level 16, State 1, Line 20 The statement terminated. The maximum recursion 100 has been exhausted before statement completion.

DECLARE @TExt NVARCHAR(MAX)
SET @TExt = '100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159,160,161,162,163,164,165,166,167,168,169,170,171,172,173,174,175,176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,191,192,193,194,195,196,197,198,199,200,201,202,203'


DECLARE @Delimiter VARCHAR(1000)= ',';
WITH    numbers
          AS ( SELECT   ROW_NUMBER() OVER ( ORDER BY o.object_id, o2.object_id ) Number
               FROM     sys.objects o
                        CROSS JOIN sys.objects o2
             ),
        c AS ( SELECT   Number CHARBegin ,
                        ROW_NUMBER() OVER ( ORDER BY number ) RN
               FROM     numbers
               WHERE    SUBSTRING(@text, Number, LEN(@Delimiter)) = @Delimiter
             ),
        res
          AS ( SELECT   CHARBegin ,
                        CAST(LEFT(@text, charbegin) AS NVARCHAR(MAX)) Res ,
                        RN
               FROM     c
               WHERE    rn = 1
               UNION ALL
               SELECT   c.CHARBegin ,
                        CAST(SUBSTRING(@text, res.CHARBegin,
                                       c.CHARBegin - res.CHARBegin) AS NVARCHAR(MAX)) ,
                        c.RN
               FROM     c
                        JOIN res ON c.RN = res.RN + 1
             )
    SELECT  *
    FROM    res

Answer 3

SELECT substring(NameValue, 1, charindex('_', NameValue)-1) AS Names, 
  substring(NameValue, charindex('_', NameValue)+1, LEN(NameValue)) AS Values
FROM Table

EDIT: Something like this put in a function or stored procedure combined with a temp table should work for more than one line, depending on the line delimiter you should also remove CHAR(13) before you start:

DECLARE @helper varchar(512)
DECLARE @current varchar(512)
SET @helper = NAMEVALUE
WHILE CHARINDEX(CHAR(10), @helper) > 0 BEGIN
    SET @current = SUBSTRING(@helper, 1, CHARINDEX(CHAR(10), NAMEVALUE)-1)
    SELECT SUBSTRING(@current, 1, CHARINDEX('_', @current)-1) AS Names, 
      SUBSTRING(@current, CHARINDEX('_', @current)+1, LEN(@current)) AS Names
    SET @helper = SUBSTRING(@helper, CHARINDEX(CHAR(10), @helper)+1, LEN(@helper))
END
SELECT SUBSTRING(@helper, 1, CHARINDEX('_', @helper)-1) AS Names, 
  SUBSTRING(@helper, CHARINDEX('_', @helper)+1, LEN(@helper)) AS Names

Answer 4

He is an example that you can use:

-- Creating table:
create table demo (dID int, dRec varchar(100));

-- Inserting records:
insert into demo (dID, dRec) values (1, 'BCQP1 Sam');
insert into demo (dID, dRec) values (2, 'BCQP2 LD');

-- Selecting fields to retrive records:
select * from demo;

Then I want to show in one single row both rows combined and display only the values from the left removing the name on the right side up to the space character.

    /*
    The STUFF() function puts a string in another string, from an initial position.  
    The LEFT() function returns the left part of a character string with the specified number of characters. 
    The CHARINDEX() string function returns the starting position of the specified expression in a character string. 
*/
SELECT 
 DISTINCT
   STUFF((SELECT ' ' + LEFT(dt1.dRec, charindex(' ', dt1.dRec) - 1) 
          FROM demo dt1
          ORDER BY dRec
          FOR XML PATH('')), 1, 1, '') [Convined values]
FROM demo dt2
--
GROUP BY dt2.dID, dt2.dRec
ORDER BY 1

As you can see here when you run the function the output will be:

BCQP1 BCQP2

On the top of the script I explained what each function is used for (STUFF(), LEFT(), CHARINDEX() functions) I also used DISTINCT in order to eliminate duplicate values.

NOTE: dt stands for "demo table", I used the same table and use two alias dt1 and dt2, and dRec stands for "demo Record"

If you want to learn more about STUFF() Function here is a link:

https://www.mssqltips.com/sqlservertip/2914/rolling-up-multiple-rows-into-a-single-row-and-column-for-sql-server-data/